From PIE *koselo-, one of the oldest unchanged tree names in Indo-European, surviving over 5,000 years.
A temperate shrub or small tree of the genus Corylus, bearing edible nuts enclosed in leafy bracts.
From Old English 'hæsel,' from Proto-Germanic *hasalaz, from PIE *koselo- meaning 'hazel.' This is one of the oldest tree names in Indo-European languages, unchanged for over 5,000 years. Key roots: *koselo- (Proto-Indo-European: "hazel").